In group 17 of the periodic table, fluorine is more reactive than chlorine, and chlorine is less reactive than fluorine. Give reasons.

Explanation

### Step-by-Step Solution

1. **Understanding Reactivity in Group 17**:
- Group 17 elements are known as halogens, which include fluorine (F), chlorine (Cl), bromine (Br), and iodine (I). Reactivity in these elements is primarily determined by their ability to attract electrons to complete their valence shell.

2. **Electronegativity**:
- Electronegativity is the measure of an atom's ability to attract and hold onto electrons. Fluorine has the highest electronegativity value of 4.0, making it the most electronegative element in the periodic table. Chlorine has a lower electronegativity value of 3.0.

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